Cable TV security means
First Claim
1. In combination with a cable TV converter having a power supply, a passive enabling circuit adapted to be connected to the TV cable at a location remote from the converter and remote from the subscriber'"'"'s premises, a sensing circuit connected to the TV cable at the converter cable input and to the converter power supply to provide power to said enabling circuit through the TV cable from the power supply, means in said sensing circuit controlling operation of said power supply in accordance with the presence or absence of the enabling circuit, and said enabling circuit, when connected to said sensing circuit and power supply, providing an input voltage at said sensing circuit to maintain operation of said power supply.
13 Assignments
0 Petitions
Accused Products
Abstract
Security means for cable television operators includes an enabling circuit which is located outside of the subscriber premises and is connected in circuit through the television cable with the power supply of the subscriber'"'"'s cable television converter located within his premises. There is a sensing circuit between the enabling circuit and the power supply which determines the presence or absence of the enabling circuit and thus controls operation of the converter power supply.
119 Citations
8 Claims
- 1. In combination with a cable TV converter having a power supply, a passive enabling circuit adapted to be connected to the TV cable at a location remote from the converter and remote from the subscriber'"'"'s premises, a sensing circuit connected to the TV cable at the converter cable input and to the converter power supply to provide power to said enabling circuit through the TV cable from the power supply, means in said sensing circuit controlling operation of said power supply in accordance with the presence or absence of the enabling circuit, and said enabling circuit, when connected to said sensing circuit and power supply, providing an input voltage at said sensing circuit to maintain operation of said power supply.
- 3. In combination with a cable TV converter having a regulated power supply, a passive resistive enabling circuit adapted to be connected to the TV cable at a location remote from the converter and remote from the subscriber'"'"'s premises, a sensing circuit connected to the TV cable at the converter cable input and having two connections to the converter regulated power supply, one of said connections being to the unregulated DC power of the power supply, said sensing circuit thereby connecting said enabling circuit through the TV cable with the power supply, means in said sensing circuit controlling on-off operation of said power supply in accordance with the presence or absence of the enabling circuit, and said enabling circuit, when connected to said sensing circuit and power supply, providing an input voltage at said sensing circuit to maintain operation of said power supply.
Specification